Antilock Brakes / Traction Control Systems: Description and Operation
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: SYSTEM DIAGRAM
SYSTEM DESCRIPTION
1. FUNCTION DESCRIPTION
(a) Electronically Controlled Brake System
(1) The electronically controlled brake system detects the amount that the brake pedal is depressed based on signals from the brake pedal stroke sensor. The system uses the skid control ECU to adjust the pressure supplied from the hydraulic pressure source for each wheel, generating optimal braking force.
(b) Regenerative Braking Cooperative Control
(1) This control performs cooperative control with regenerative braking that is specific to hybrid vehicles to efficiently charge the HV battery.
(c) Vehicle Dynamics Integrated Management (VDIM)
(1) VDIM integrates hybrid drive brake control (ABS with EBD, BA, TR(A)C, VSC and hill-start assist control) and steering assist control to enhance active safety when accelerating, turning and stopping.
(d) Steering Cooperative Control
(1) Performs cooperative control with the power steering ECU in order to provide steering torque assist in accordance with present vehicle dynamics.
(e) Anti-lock Brake System (ABS)
(1) The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking on a slippery surface.
(f) Electronic Brake force Distribution (EBD)
(1) EBD control utilizes the ABS, realizing proper brake force distribution between the front and rear wheels in accordance with the driving conditions. In addition, when braking while cornering, it also controls the brake force applied to the right and left wheels, helping to stabilize vehicle behavior.
(g) Brake Assist (BA)
(1) The primary purpose of brake assist is to provide supplementary brake force to assist a driver who cannot generate a large brake force during emergency braking, thus helping ensure the vehicles braking performance.
(h) Traction Control (TR(A)C)
(1) The TR(A)C helps restrain the slippage of the drive wheels if the driver depresses the accelerator pedal excessively when starting off or accelerating on a slippery surface.
(i) Vehicle Stability Control (VSC)
(1) The VSC helps restrain sideways slippage of the vehicle during a strong front wheel skid or strong rear wheel skid, such as may occur while cornering.
(j) Hill-start Assist Control
(1) The hill-start assist control generates four-wheel hydraulic pressure when the brake pedal is further depressed while the vehicle is stationary in order to prevent the vehicle from moving backward.
(k) Limited Slip Differential (LSD) Function
(1) The LSD function detects the vehicles turning condition and wheel slippage. Brake force is then applied to the inner wheels to limit slippage and transmit power to the outer wheels, ensuring acceleration performance while turning.
2. FUNCTION OF COMPONENTS
*: Electronically Controlled Brake System